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Multielement synthetic transmit aperture imaging using temporal encoding.

Kim Løkke Gammelmark1, Jorgen Arendt Jensen

  • 1Center for Fast Ultrasound Imaging, Orsted, DTU, Building 348, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark. klg@oersted.dtu.dk

IEEE Transactions on Medical Imaging
|May 31, 2003
PubMed
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This study introduces a new synthetic aperture imaging method using spherical waves and frequency-modulated signals. It significantly improves ultrasound image quality, enhancing resolution and penetration depth for better clinical diagnostics.

Area of Science:

  • Ultrasound imaging
  • Medical physics
  • Signal processing

Background:

  • Synthetic aperture imaging offers potential for enhanced ultrasound resolution.
  • Conventional methods face limitations in signal-to-noise ratio (SNR) and penetration depth.
  • Optimizing transmit signals is crucial for improving ultrasound image quality.

Purpose of the Study:

  • To investigate a novel method for improving the signal-to-noise ratio (SNR) in synthetic transmit aperture imaging.
  • To evaluate the impact of using emulated spherical waves and linear frequency-modulated (FM) signals on image quality.
  • To assess the clinical applicability of the new imaging approach.

Main Methods:

  • Emulation of spherical wave transmission using multiple transducer elements.

Related Experiment Videos

  • Replacement of short excitation pulses with linear frequency-modulated (FM) signals.
  • Evaluation through Field II simulations and experimental measurements using the RASMUS system.

    • Main Results:

    • Simulations show up to 30% improvement in lateral resolution and 10.75% in contrast resolution.
    • Experimental SNR improvements ranged from 4-12 dB with temporal sidelobes below -55 dB.
    • A 30 mm (approx. 45%) increase in penetration depth was achieved in a phantom study.

    Conclusions:

    • The proposed synthetic aperture imaging method effectively enhances image quality parameters.
    • The use of FM signals and spherical wave emulation leads to significant improvements in SNR and resolution.
    • The approach demonstrates potential for improved clinical ultrasound diagnostics, particularly in abdominal imaging.